I think the MP5SD only has a vented barrel at the rear of the silencer, I think it has traditional baffles at the forward end. And I would think that simply having a vented barrel with a baffle system around it wouldn't be enough to suppress a shotgun; maybe they're large slots that contain the wad but allow more gas to flow to the baffes? I actually have no idea, I'm simply speculating here.
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0331: "Accuracy by volume."
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